Starting at £300

M140i/M240i/M340i/M440i OEM exhaust mod

I've modded lots of these with great results, a deeper, aggressive sound with clearer more defined crackles.

the process involves me removing the exhaust from the car and opening the silencers from above, inside each is a series of chambers and pipework, I use stainless parts and welding wire to internally alter the airflow, once put back together and back on the car no evidence of my work can be seen.

this also leaves the valve functional so you still have a loud/quiet option, meaning no drone when cruising.

here is a diagram of the '40i' exhaust.

backbox modified is £300, backbox and 1 resonator is £350, both resonators and back box £380.

This modification is issue free, never had any warranty issues, MOT, Emissions all unaffected, I offer a guarantee of all my work for the lifetime of your ownership of the car.

both resonators and backbox below

there is also the opf/ppf/gpf model which is july 2018 build date onwards, this exhaust does not have the resonator nearest the downpipe but instead has a new petrol particulate filter.

the filter can not be removed without mapping, which i can do if required via Bootmod3.

the standard mod without mapping is the larger resonator and backbox which makes it £350. no issues will be caused with the filter, bmw changed the mapping on the filter model also, so pops are very occasional rather than whenever you let off, a deeper much better exhaust note is still achieved from modification though. a video off a filter model below.